Fuel-feeding mechanism for underfeed stokers



Patented July 12,1927.

UNrrr-Dv lSTATES i IBVING A. TAYLOR, OF WORCESTER, MASSACHUSETTS, ASSIGNOR T RILEY STOXER CORPORATION, 0F WOBGESTER, MASSACHUSETTS, A CORPORATION 0F MASSA- CHUSETTS.

rUEL-rannrne Meenemen non Unmanrnnn sroxnas.

Application led December 31, 1921-. Serial No. 528,370.

This invention relates to a furnace Stoker of the underfeed type' and more particularly to means for controlling the feed of fuel thereto. Modern furnaces are commonly built up of a number of separate retorts, veach furnace comprising a greater or less number of retorts according to the size of the boiler to be heated.: to control and vary the 'fuel feed to a lo particular retort so. that variations the depth of the fuel bed may be eliminated and that an even i'ire may be maintained throughout the width of the furnace.

It is the object of my invention to prol-vide improved means for thus varying the fuel feed bythe use of lost motion connecv tions between a ram or plungerby which coal is fed to the separate retorts.- This arrangement permits the use of 'a single continuously movingv lcrankshaft'extendingv the full width of the furnace and Yprovided with a crank and crank pin for each retort, while at the same time separate control of the fuel feed a each retort is rendered possible. My invention further relates to arrangements and combinations of 'parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of my invention is shown in the drawings in which Fig. 1 is a sectional elevation showing portions of a fuel feeding mechanism, together with my improved driving connections therefor;

F ig. 2 is a sectional plan view of cert-aiu of the parts shown in Fig. l;

Fig. 3 is a perspective view, partly in sec- Figs. 4 and 5 are transverse sectional elevations taken along the line 4-4 and 5-5 of Fig. 1, and lig.- 6 is a diagrammatic view of a plurality of retorts and coal feeding mechanism therefor. I

Referring to the drawings, I have shown portions of an under'fed stoker which is, in

general, of the usual type and comprises a hopper 10, a cylinder 11, a rain or plunger 12 slidahle therein, a fuel chute or casing 13 leading from the cylinder to the retort, and

a crank shaft 14 comprising a'series of crank pins 15. v

A recessed member or yoke `16 is pivotally It is often desirable driving crankshaft and each tion2 of my improved driving connections,

adjacent end ofthe yoke 16 an mounted within the ram 12 and is preferably supported upon the inner ends'of short shafts or rods 17 extending through bearings 18 within the ram and secured in fixed position therein in any suitable and convenient manner as by.. bolts 19. -The yoke 16 is thus firmly 'supported within the ram but is permitted to rock freely about the axis of the shafts 17 as a center. A cylindrical opening 2O extends longitudinally through the yoke 16 and this opening is provi ed with oppositely disposed grooves or guideways 21 (Fig. 4).

Aligned transverse openings 22 and 23 (Fig. l) are formed inthe yoke 16 and one or more openings 24 are formed in a connecting rod 25 which 20 of the yoke.'r When the parts are assembled, a cross pin' 26 is inserted through the opening 22, this pin fitting the opening 24'in the rod 25 and the projecting ends of the pin being slidable in the grooves -21 of the yoke 16. The opening 23 is smaller than the pin 26 and is provided merely to permit is slidable in the opening a tool to be mserted for driving out the pin 26 when it is desired to remove the rod 25 from the yoke.

The connecting 'rod'25 is provided witha suitable connecting rod head 25 by which it is attached to one of the crapk pins 15 -of the crank shaft'14. Stop lugs 27 are mounted in additional transverse openings in the yoke 16, these lu s being T-shaped 1n outline with their hea s fitting within the grooves 2 1 when in operative position. In assembling the parts the T-shaped lugs are within the vyoke and are thereafter held i Vinserted in the transverse openings from-v from inward displacement by the rod 25.

As the rod 25 is drawn outward, the pin -26 slides freely along the grooves 21 until it engages the stop ment it moves the ram 12 to Withdraw the lugs 27, after which engagesame from the cylinder 11.

A collar l2,8 is secured to the rod 25 by in serting a shearing in 29 through the collar and through one oi) several transversel holes 80 in the rod. As the ram- 12, v the collar-28 vpresenti;1 engages the tive drivingconnection to force the ram 12 into the cylinder 11.v e

The amount of lost motion .rod 25 and the ram 1 2 may be reduced by rod moves toward thebetween the forms a posiclose contact and each being secured to the plunger by its separate shearing pin.

My feeding mechanism thus operates to fully Withdraw the feeding ram after each feeding stroke, but the effective vadvance feeding movement of the rain may be variedv and adjusted to suit operating conditions by changing the amount of lost motion betweeny the rod and ram, either by moving the collar" 28 or by inserting or removing one or more spacing devices 31.

While described with particular reference to multiple retort stokers, my invention may be advantageously used in many cases with single retort/strikers, particularly when several such stokers have a common air supply or are driven' from a single or invariable source of power.

Having thus described my invention, the advantages thereof will be readily apparent, and it will be'further evident that changes and modifications canrbemade therein Within the s irit and scope thereof as set forth in the c aims. Accordingly, I do not wish' to be otherwise limited tothe details herein v disclosed but what I claim is 1.- In'an underfeed Stoker, in combination, a cylinder, a coal feeding ram slidable there-- in, a crank shaft, a comieetingl rod, a. yoke transversely pivoted in said ram and having said lugs to move said ram in one direction, i

and means moved by said connecting rod effective to move said ram in the opposite direction.

2. In an underfeed Stoker, a. cylinder, a coal feeding ram slidable therein, a crank shaft, a connecting rod having across pin, a yoke ivoted on a transverse axis in said ram and) havingan opening through which said rod is slidable, said opening having grooves to receive the ends of said cross pin, a pair of stop lugs in said yoke having their inner ends disposed in said grooves and engaged by said cross pin to move said rain in one direction, and means moved by said connecting rod effective to move said ram in the opposite direction.

3. In 'an underfeed Stoker, a.j cylinder a. coal feeding ram slidable therein,'a crank shaft, a connect-ing rod, a yoke pivoted in said ram andhavmg an opening in which 'said rod is slidable, said rod having a pro- Y l jection thereon and said yoke having an abnt- Y ment therein and engaged by said project-ion' `at a point within said yoke `to limit sliding movement of said rod in said yoke in one direction, and means to adjustably limitslidin movementof said rod relative to said.

yoke in the opposite direction.

ny whereof I have hereunto affixed my signature.

ravine A. TAYLOR. 

